Forces, accelerations and Newton's laws of motion — WJEC GCSE Physics
In summary: Forces, accelerations and Newton's laws of motion is a key topic in WJEC GCSE Physics. Key exam tip: Always state the formula being used before substituting values.
Exam Tips for Forces, accelerations and Newton's laws of motion
- Always state the formula being used before substituting values.
- Ensure all units are converted to SI units (e.g., kg, m/s) before calculation.
- Use vector notation or clear descriptions when discussing forces acting on objects.
- Remember that Newton's Third Law involves forces acting on two different objects.
Common Mistakes
- Confusing mass with weight in calculations.
- Failing to identify that Newton's Third Law applies to pairs of objects.
- Incorrectly applying the conservation of momentum to two-dimensional problems.
- Misinterpreting inertial mass as simply the amount of matter in an object rather than a measure of resistance to acceleration.
Marking Points
- Recall and application of Newton's First Law regarding uniform velocity and changes in motion.
- Calculation of resultant force using F = ma.
- Definition of inertial mass as the ratio of force over acceleration.
- Recall and application of Newton's Third Law.
- Definition of momentum as p = mv.
- Application of the principle of conservation of momentum to one-dimensional interactions.
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